Valve tester



Nov. 4 1924-.

W. A. CANNON VALVE TESTER Filed April 16. 1923 lNVENTOR BY I TTORNEYJ Patented Nov. 4, 1924.

PATENT OFFICE.

WILLIAM A. CANNON, OF CARMEL, CALIFORNIA.

VALVE TESTER.

Application filed April 16.

To aZZ whom it may concern:

Be it known that I, WILLIAM A. CANNON, a citizen of the United States, and a resident of Carmel, county of Monterey, and State of California, have invented a new and useful Valve Tester, of which the following is a specification.

The present invention relates to improvements in valve testing devices and has particular reference to a device adapted to be used for discovering leakages in the valves of the pneumatic tubes of a motor vehicle. It should be understood, however, that although the device is described in the present invention as particularly adapted to be used for this purpose, it may be used in various other connections. It is particularly proposed in the present invention to utilize a diaphragm having an indicating device attached thereto and to subject the same to the action of the pressure medium leaking through the valve.

The preferred form of the invention is illustrated in the accompanying drawing in which Figure 1 shows a side view of my valve tester; Figure 2 a vertical section through the same; Figure 3 a top plan view of the same; and Figure 4: a vertical section through a modified form of a valve tester. While I have shown only the preferred form of the invention, it should be understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

In its preferred form my valve tester (1) comprises a preferably cylindrical chamber (2) to the open end (3) of which is secured a diaphragm (4) by being clamped between the chamber end and the cap (6) adapted to threadedly engage the cylindrical chamber as shown at (7 The diaphragm has secured thereto in any suitable manner a piston (8) which extends through the closed opposite end (9) of the chamber and is provided at its end with a disc (11) adapted to engage a seat (12) formed in the closed end of the chamber. A spring (13) coiled around the piston (8) forces the same downward and holds the diaphragm under tenson.

A small second chamber (14) is formed between the diaphragm (4) and the cap, which latter terminates in a neck (16) adapted to communicate with the valve (18) only partly shown in the drawing. A gasket 1923. Seriall No. 632,441.

'(19) interposed between the end of the neck and a small cap (20) extends inwardly sufficiently far to engage the top of the valve (18) and to secure an air tight connection.

To use the device, it is placed on top of the valve in the manner shown in Figure 2. If the valve is leaking the pressure medium controlled by the valve enters the chamber (14) and presses the diaphragm (4) up wardly, thereby pushing the piston (8) upwardly over the resistance of the spring (13) and indicating to the operator that the valve is leaking. The diaphragm is preferably made of flexible material such as rubber, leather, silk or the like.

The modified form shown in Figure 4 has a slightly different diaphragm arrangement. In this case the diaphragm consists of a conical member (21) made of flexible material such as rubber, leather, silk or the like, having a metal plate (22) secured to its small end and terminating at its larger end in a flange (23) adapted to be clamped between the cap (24) and the chamber (26). In its principle of operation, this device does not difler from that shown in Figure 2.

I claim:

1. In means for testing a valve controlling a pressure medium, a diaphragm having a piston associated with one side thereof, spring means engaging the said side for placing the diaphragm under tension and an operative connection between the valve and the other side of the diaphragm allowing the pressure medium leaking through the valve to bear on the former for actuating the piston.

2. In means for testing a valve controlling a pressure medium, a chamber having a diaphragm embodied therein, a piston associated with the diaphragm extending through the wall of thechamber, spring means for placing the diaphragm under tension and an operative connection between the diaphragm and the valve allowing the pressure medium leaking through the valve to bear on the diaphragm for actuating the piston.

3. In means for testing a valve controlling a pressure medium, a chamber having a diaphragm embodied therein, a piston extending through the wall of the chamber, spring means for placing the diaphragm under tension and a cap for the chamber enclosing the diaphragm formed to communicate with the valve so as to allow the pressure medium leaking through the valve to bear on the diaphragm for actuating the piston.-

4. In means ling a pressure medium, a chamber having a flexible element embodied therein, a piston associated with the element extending through the wall of the chamber, spring means for placing the element under tension and an operative connection between the flexible elementand the valve allowing the P essu e. me ium eaking rough the val e to bear onthe element forv actuating the pisfor testing a valve control-- 5. In means for testing a valve controlling a pressure medium, a chamber having a flexible element embodied therein a piston associated with the element extending through the wall of the chamber, spring means for placin the element under tension and a cap for the chamber enclosing the flexible element formed to communicate with the valve so as to allow the pressure medium leaking through thevalve to bear on the flexible element foractuating the piston. 7

WILLIAM CANNON. 

